MAF Method Zone 2 Turbo Session: Low Heart Rate Bike Training

Session Overview

This is a structured aerobic base session built around the MAF Method (180 minus your age, adjusted for training history) rather than a fixed power or pace zone. The turbo trainer is the ideal environment for this style of session, since a controlled indoor effort makes it far easier to hold a strict heart rate ceiling than riding outdoors with hills, junctions and wind to contend with.

What You’ll Need

• Turbo trainer or smart trainer
• Heart rate monitor (chest strap preferred for accuracy at low, steady intensities)
• Your calculated MAF heart rate ceiling (180 minus your age, plus or minus the standard adjustment for training history)

Warm-Up (10 minutes)

Start well below your MAF ceiling — 15-20 beats under is a reasonable starting point — and gradually build heart rate up towards (but not over) your ceiling by the end of the warm-up. Keep cadence relaxed, around 80-85rpm, and use this time to settle your breathing before the main set begins.

Main Set

40 minutes continuous, holding your heart rate at or just under your MAF ceiling throughout. This is not an interval session — the goal is a single, unbroken steady effort.

• Set your trainer to a moderate, consistent resistance rather than a specific power target — heart rate, not power or speed, is the number you’re pacing to today.
• If your heart rate drifts over your ceiling, ease off resistance or cadence immediately rather than waiting for it to settle back down on its own — the discipline of staying under the number is the entire point of the session.
• Aim for a cadence of 85-95rpm through the main set — MAF sessions are commonly ridden at a slightly higher cadence than race pace, since spinning an easier gear makes it simpler to stay under your heart rate ceiling.
• Note your average power or speed at the end of the session against your MAF heart rate ceiling — tracking this figure over repeated sessions (a rough version of the MAF Test) is how you’ll see aerobic base improvements over time, even though every individual session feels the same.

Cool-Down (10 minutes)

Ease resistance right down and spin easy, letting heart rate drop well below your MAF ceiling. Use this time to relax cadence and let your legs unwind rather than continuing to chase a specific number.

Coaching Notes

• If your MAF pace or power feels frustratingly slow compared to your fitness, that’s normal and expected in the first weeks of applying the method — resist the urge to creep the ceiling up to make the session feel more like “real training.”
• The most common mistake on this session is letting heart rate drift a few beats over the ceiling and telling yourself it’s close enough — the aerobic-base benefit of MAF training depends on genuinely staying under the number, not near it.
• To make this session easier, shorten the main set to 25-30 minutes while you build tolerance. To make it harder, extend the main set towards 60 minutes once 40 minutes feels comfortably sustainable.
• This session should feel like RPE 3-4/10 throughout — genuinely easy, conversational effort. If it feels harder than that, your heart rate ceiling or its underlying assumptions may need rechecking.